Joan Lunden

Joan Lunden, who co-hosted "Good Morning America" for 17 years, has been diagnosed with breast cancer.

"In the beginning, it's such a shock, it's a stunner, and you think, 'I do everything right!,'" she said on her old show, sitting down Tuesday to break the news with current co-host Robin Roberts, a breast-cancer survivor.

Lunden has already started chemotherapy, she said in a statement, "and while I don’t know how I’ll look and feel down the road, I am assuming the best because that is how I live my life." In...

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Joan Lunden, who co-hosted "Good Morning America" for 17 years, has been diagnosed with breast cancer.
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